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Full text of "IS 666-2: Jig Bushes, Part 2: Renewable Drill Bushes"

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Disclosure to Promote the Right To Information 

Whereas the Parliament of India has set out to provide a practical regime of right to 
information for citizens to secure access to information under the control of public authorities, 
in order to promote transparency and accountability in the working of every public authority, 
and whereas the attached publication of the Bureau of Indian Standards is of particular interest 
to the public, particularly disadvantaged communities and those engaged in the pursuit of 
education and knowledge, the attached public safety standard is made available to promote the 
timely dissemination of this information in an accurate manner to the public. 




Mazdoor Kisan Shakti Sangathan 
"The Right to Information, The Right to Live" 



IS 666-2 (1972): Jig Bushes, Part 2: Renewable Drill Bushes 
[PGD 2: Machine Tool Elements and Holding Devices] 




Jawaharlal Nehru 
'Step Out From the Old to the New' 



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Satyanarayan Gangaram Pitroda 
Invent a New India Using Knowledge 



Bhartrhari — Nitisatakam 
"Knowledge is such a treasure which cannot be stolen" 




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BLANK PAGE 



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PROTECTED BY COPYRIGHT 



UDC 821-95-2W31M : 62VK2-5 ( j^d Rep rint NOVEMBER 2000 ) IS : 666 ( Part 1 1 ) - 1972 



Indian Standard REAFFIRMED 

SPECIFICATION FOR JIG BUSHES 

PART II RENEWABLE DRILL BUSHES 

( Second Revision ) 



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1. Scope— Dimensions and requirements for renewable drill bushes and associated liner bushes and 
locking device. Renewable drill bushes are those intended for insertion in a liner which has been fitted 
directly into a part of the jig. 

2. Types — Two types of renewable drill bushes, namely, ' slip ' and ' fixed ' types have been covered 
in this standard. Slip renewable bushes are designed to facilitate rapid changing in cases where, 
for instance, several differing operations and tools are required to follow the same general guide, 
whereas the fixed renewable bushes are intended to remain in the jig until too worn for further 
use. 

3. Dimensions 

3.1 Renewable Drill Bushes — As specified in Table 1 . 

3.2 Liner Bushes— As specified in Table 2, 

3.3 Locking Screws — As specified in Table 3. 

4. Material 

4.1 Renewable Drill Bushes: 

d x < 30 mm — direct hardening or oil hardening steel. 

tf, > 30 mm — direct hardening steel or case hardening steel with a case depth of 05 to 0*8 mm 
and a core strength of 600 MN/m 2 , Min ( «* 60 kgf/mm 2 , Min ). 

4.2 Liner Bushes — Suitable steel with a tensile strength of 600 MN/m 2 , Min ( ** 60 kgf/mm 2 , Min ) . 

4.3 Locking Screws — Mechanical property class 109, semi-precision grade (S) of IS: 1367-1967 
' Technical supply conditions for threaded fasteners ( first revision ) '. 

5. Hardness — 740 to 820 HV ( 62 to 65 HRC ). 

Note — Hardness conversion values specified are approximate. 

6. Marking — Renewable drill bushes and liner bushes shall be marked with the size and tolerance class 
of the bore. 

6.1 Certification Marking — Details available with the Bureau of Indian Standards. 



Adopted 18 January 1972 



© November 1972, B IS 



Gr4 



BUREAU OF INDIAN STANDARDS 

MANAK BHAVAN, 9 BAHADUR SHAH ZAPAR MARQ 

NEW DELHI 110002 



IS: 666 (Part II) -1972 




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AMENDMENT NO. 2 MAY 1986 



AMENDMENT NO. 1 APRIL 1980 
TO 

IS : 666 ( Part II ) - 1972 SPECIFICATION FOR 
JIG BUSHES 

PART li RENEWABLE DRILL BUSHES 

( Second Revision ) 

Corrigenda 

( Page 3, Table 1, entries under ' Zi ') — Substitute ' 002, 0*03 and 004 • 
for ' 0*01, 0015 and 0-02 ' respectively. 

( Page 4, Table 2, last column, entries under % z« ') — Substitute '0-01, 0*02 
and 0-03 ' for • 0005, 0-010 and 0015 ' respectively. 



( 2DC11) 

Printed at Simco Printing Press Delhi, India 



AMENDMENT NO. 2 MAY 1986 
TO 

IS t 666 ( Part II ) - 1972 SPECIFICATION FOR JIG BUSHES 
PART II RENEWABLE DRILL BUSHES 
f Second Revision J 

( Page 5, Table 3 ) — Add the following in the table under respective columns: 



*9 

*6 

M6 
M6 



*10 

10 


<*n 


16 
16 


10 



10 



10 



'io i ij 



16-5 
18-5 



2*5 



2 ! 25 



I LUC 11 ) 



Puntec! at Simco Punting Press, Delhi, IncJi; 



IS: 646 (Part II) -1972 





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IS: 666 (Part II) -1972 



TABLE 2 DIMENSIONS FOR LINER BUSHES 

( Clause 3.2 ) 
All dimensions in millimetres. 

W (WV) 



b 



JZQC- 



"ZZfiS 



n 



-60* 



I 



i 



iK 



•d 2 f- 
-d 7 *- 






£ 



RELIEF OROOVB 

According ro 

K 3428 



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s 



TYPE A HEADED LINER BUSH 



-d 7 *- 



■ 



Other dimensions and details 

are same as for Type A 

TYPE B HEADLESS LINER BUSH 



*2 

H7 



10 



15 



22 



28 



35 



46 



58 



Short 



10 



12*5 



16 



20 



25 



Long 



125 



16 



20 



25 



32 



40 



25 



0*7 

m6 



12 



15 



20 



28 



36 



46 



56 



70 



15 



18 



24 



32 



40 



50 



60 



74 



0005 



0-010 



0015 



Note — Dimensional deviation for untoleranced dimensions: 

Medium class according to IS : 2102-1969 

Designation: 

A headed liner bush having d% — 22 mm and / 7 — 25 mm shall be designated as: 
Liner Bush A 22 X 25 IS : 666 ( Part II ) 



IS: 666 (Part II) -1972 



TABLE 3 DIMENSIONS FOR LOCKING SCREWS 

(Clause 3.3) 

All dimensions in millimetres. 



RELIEF GROOVE 
ACCORDING TO 
IS: 3428 




*9 


'8 


*10 


*n 


1. 


155 


»i 


ti 


M5 


5 


7'5 


12 


8 


16 


2 

25 


M6 


6 
7'5 


10 


16 


10 


19-5 


2 


21 


M8 


10 


13 


20 


12 


27 


2'5 


3 


Note — Dimensional deviation for untoleranced dimensions: 

Medium class according to IS : 2102-1969. 

DesfgnMtfon: 

A locking screw with o* 9 — M6 and shoulder length / 8 — 7*5 mm shall be designated as: 
Locking Screw M6 x 7*5 IS : 666 ( Part II ) 



IS: 666 (Part II) -1972 

APPENDIX A 

( Footnote Under Table 1 ) 

EXAMPLES OF APPLICATION OF RENEWABLE DRILL BUSHES 
A-1. Fixing Method 







TYPE A FIXED 
RENEWABLE BUSH 




TYPE B SLIP 
RENEWABLE BUSH 




TYPE C SLIP 
RENEWABLE BUSH 







All dimensions in millimetres. 






Renewable Drill Bush 


Liner Bush 


e 


Mln 


Locking 
Screw 


dx 
67 


d* 

he 


d 2 
H7 


d,* 
m6 


Over 


Up to 


— 


2*65 


8 


8 


12 


115 


10 


M5 X 5 


2*65 
475 


475 


10 


10 


15 


130 


8-5 
14 


15 


15 


20 


17*5 


r 12 


M6X6 


8*5 


22 
28 


22 


28 


21'5 


14-0 


19 


28 


36 


255 


M6 X 7-5 


190 


25 


35 


35 


46 


3V0 


25-0 


335 


46 


46 


56 


37'0 


15 


M8 X 10 


33*5 


45 


58 


58 


70 


44*0 


•Tolerance zone of bore (/g In Jig plate « H7 



IS: 666 (Part II) -1972 



A-2. Length off Bushes^,) 




EXPLANATORY NOTE 

This standard was first published in 1963, covering the requirements of headed and headless 
type of jig bushes and slip bushes. The details of form of the heads pertaining to the slip bushes were 
omitted in the earlier standard in order to permit improvement in design. With advancement of new 
technical knowledge in the locking of jig bushes, it has been decided to standardize slip bushes with 
locking arrangement. The standard on jig bushes is now issued in the following two parts: 

Part I — Headed and headless jig bushes; and 
Part II — Renewable drill bushes. 

Renewable Drill Bushes — Fixed renewable drill bushes, Type A, have milled out portion at the 
head with which they can be securely locked in the jig plate by means of locking screws. Types B and 
C are slip renewable bushes with alternate form of heads for locking arrangement. Dimensions have 
been so chosen so that the three types of renewable drill bushes can be made from the same blank and 
the same locking screw can be used for locking the bushes. 

In order to assure that the twist drill is properly guided, the shoulders for the bush d t are 
provided with 120° chamfer. For proper introduction of the drilling bush in the liner bush, a chamfer 
of 30° Is provided at the outside diameter c/ a . 

Types B and C slip renewable bushes can also be provided with an entry groove. This permits 
very quick entering, but it must be protected against damage and dirt. This means that it must not 
project beyond the liner bush. 



Printed at Slmco Printing Preaa, Dalhl. India